Re: [Qemu-devel] [PATCH v6 00/12] curl: fix curl read

["Richard W.M. Jones" <rjones@redhat.com>]

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On Mon, May 27, 2013 at 10:25:21AM +0800, Fam Zheng wrote:
> On Fri, 05/24 09:07, Richard W.M. Jones wrote:
> > On Fri, May 24, 2013 at 01:36:55PM +0800, Fam Zheng wrote:
> > > Changes from v5:
> > >   05: Rename bs to s for BDRVCURLState.
> > >   06: Use int64_t for offsets.
> > >       Fix printf format string.
> > >       Move introducing of use_count to 07.
> > >   07: Drop explicit cast.
> > >       Use int64_t for offsets.
> > >       Use_count moved here.
> > >   08: Remove duplicated.
> > >       Move s->url = NULL to separate patch.
> > >   09: Fix while(0);
> > >   12: Added:
> > >       curl: set s->url to NULL after free.
> > 
> > This patch is definitely not working.  The guest sees loads of
> > disk errors like this:
> > 
> > [   30.880265] sd 2:0:0:0: [sda]  
> > [   30.880265] Add. Sense: I/O process terminated
> > [   30.880265] sd 2:0:0:0: [sda] CDB: 
> > [   30.880265] Read(10): 28 00 00 bf b0 87 00 00 01 00
> > [   32.030702] sd 2:0:0:0: [sda]  
> > [   32.031663] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
> > [   32.031663] sd 2:0:0:0: [sda]  
> > [   32.031663] Sense Key : Aborted Command [current] 
> > [   32.031663] sd 2:0:0:0: [sda]  
> > [   32.031663] Add. Sense: I/O process terminated
> > [   32.031663] sd 2:0:0:0: [sda] CDB: 
> > [   32.031663] Read(10): 28 00 00 00 08 46 00 00 01 00
> > [   32.031663] blk_update_request: 32 callbacks suppressed
> > [   32.031663] end_request: I/O error, dev sda, sector 2118
> > [   32.031663] quiet_error: 46 callbacks suppressed
> > [   32.031663] Buffer I/O error on device sda1, logical block 2055
> > [   32.031663] sd 2:0:0:0: [sda]  
> > [   32.031663] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
> > [   32.031663] sd 2:0:0:0: [sda]  
> > [   32.031663] Sense Key : Aborted Command [current] 
> > [   32.031663] sd 2:0:0:0: [sda]  
> > [   32.031663] Add. Sense: I/O process terminated
> > [   32.031663] sd 2:0:0:0: [sda] CDB: 
> > [   32.031663] Read(10): 28 00 00 00 08 45 00 00 01 00
> > [   32.031663] end_request: I/O error, dev sda, sector 2117
> > [   32.031663] Buffer I/O error on device sda1, logical block 2054
> > [   32.031663] sd 2:0:0:0: [sda]  
> > 
> 
> Rich, are you testing with libguestfs or qemu? Since I can't get
> libguestfs run with your patch to refuse writable open.

You need to add the --ro option and make sure LIBGUESTFS_BACKEND=direct.

> Can you post your command?

Sure, I'm using the attached test script.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming blog: http://rwmj.wordpress.com
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